Selena Gomez and Taylor Swift are reportedly at odds over Justin Bieber amid reports claiming the couple is back on.

The longtime friends have often clashed over Bieber, 20, in the past and insiders claim Swift recently set new ground rules for Gomez following her latest reconciliation with the singer.

Bieber and Gomez, 21, have been seemingly inseparable in recent weeks fueling reports that they are back together and while Swift has agreed to still be friends with the former Disney star, she does not want to hear about the reconciliation.

"Taylor and Selena are still friends even though she went back to Justin but Taylor has set some boundaries which include no talking about Justin," a source told HollywoodLife.com.

"Taylor really cares about Sel but she doesn't want to be an enabler when it comes to Justin," the insider explained.

Bieber and Gomez split in April after a reported fight at Coachella however they recently rekindled their relationship.

(PHOTO) Instagram: @justinbieber

Justin Bieber and Selena Gomez

Earlier this year the "Come & Get It" singer had a stint in rehab for stress and at the time fans speculated whether the ongoing drama with Bieber was to blame.

In the past Gomez, who has dated Bieber on and off since 2011, has often turned to Swift for emotional support during her relationship woes. A source claims that this time around Swift wants no part in the drama.

"Taylor has spent countless hours giving her support and advice but that's it. She will always be there for Sel but isn't giving any more advice on the matter," the source said.

"If Selena has any issues, Taylor suggested that she speak with a therapist because she doesn't want to get in the middle of it," the source added.

Bieber and Gomez was captured on video partying together at a mutual friend's birthday on Monday which appeared to support the claims that they are working on their relationship. While fans are thrilled about the reconciliation, Swift is reportedly skeptical.

"She tried to help out, it didn't work and now she is waiting to tell Selena when Justin breaks her heart again that 'I told you so!'" the insider said.